Something odd on my rocket

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jb

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Something odd on my rocket
« on: September 14, 2009, 11:24 »
Hi,
Can anyone identify what is on my wild rocket. A couple of weeks ago  a large number of white spots appeared that looked like small droplets of paint had been spattered on the plant. These did not wash off. Now the spots are swelling and going the same green as the plant as they form pustules about 2-3mm across.
I haven't been able to identify what this could be, so can anyone help? My inclination is to remove the plants, although i am loathe to as they are two years old and otherwise very vigorous. But if it is a nasty can you also indicate whether I should compost or burn the plants.
Here is a picture, sorry about the quality,



Thanks
Jon

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pushrod

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Re: Something odd on my rocket
« Reply #1 on: September 14, 2009, 11:41 »
I grow a lot of rocket but not seen anything like that. Have you tried opening them up and seeing if anything is inside? Could be a bug or a plant virus?
My inclination, like yours, would be to either dig them or cut them back hard and see what the new growth is like. If you do pull them out chances are they have self seeded if they have been in the same place for two years so more will be along shortly :)
All these moments will be lost in time, like tears in rain.

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HilaryG

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Re: Something odd on my rocket
« Reply #2 on: September 14, 2009, 13:49 »
Does it look like this? Is it mealy bug?
S7001957.JPG
The less time you have, the more becomes available.

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agapanthus

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Re: Something odd on my rocket
« Reply #3 on: September 14, 2009, 15:04 »
Looks like some type of mould to me.

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savbo

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Re: Something odd on my rocket
« Reply #4 on: September 14, 2009, 15:15 »
them going green like the rocket made me think of some kind of gall but nothing came up on google for rocket gall (well some very strange things came up but not a plant disease...)

it would be interesting to see if there's a wee grub inside the larger blobs...

M


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Salmo

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Re: Something odd on my rocket
« Reply #5 on: September 14, 2009, 22:19 »
Sound like this

The disease white blister is caused by the pathogen Albugo candida. It affects many
economically important brassica crops including broccoli, cauliflower, Brussels sprouts, rocket, radish and many common brassica weeds.

Plants infected by A. candida show two types of symptoms: white pustules or ‘blisters’ of various sizes on leaves and heads of broccoli and cauliflower, and/or distortions and swellings of leaves, stems and heads.

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mumofstig

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Re: Something odd on my rocket
« Reply #6 on: September 15, 2009, 10:36 »
Well found Salmo..I'm impressed :) It looks like this in the articles...is it the same?

link

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jb

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Re: Something odd on my rocket
« Reply #7 on: September 16, 2009, 21:27 »
Yes you have nailed it, many thanks Salmo (and thanks fo all the other suggestions as well of course), screening the web for images has confirmed it in my mind that it is white blister.

Surprisingly it is quite common but info on the web is quite sparse. If anyone else has or believes they have it this is the best info I have found so far

http://www.which.co.uk/documents/pdf/brassica-diseases-151474.pdf

Sadly it means my winter supply of rocket is out to be destroyed tomorrow  :(

Jon



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